Principal Test Engineer (mixed signal) - Huntsville, AL

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Job Summary:

Mercury Systems is seeking the best and brightest talent to help us bring cutting-edge technology to mission-critical aerospace and defense applications, advancing innovation where it matters most. Our Mixed Signal business unit is seeking an experienced Principal Test Engineer to develop and execute comprehensive test strategies for sophisticated mission-critical embedded technology designed to withstand the most rugged environments. This role requires deep expertise in digital hardware testing, ASIC/FPGA verification, and environmental qualification testing for aerospace and defense applications. You will own the complete test lifecycle from Design Verification Testing (DVT) through production test deployment, including test automation software development, test fixture design, and formal qualification documentation.

This is an ideal opportunity for someone who thinks like a design engineer but lives in the test world-someone who can build test infrastructure as a product in its own right with the same rigor applied to flight hardware.

Job Responsibilities:

• Develop and execute Design Verification Test (DVT) plans and procedures for complex digital circuits, modules, and systems including ASIC integration and FPGA verification
• Design, build, and certify test fixtures, cable harnesses, and test interface boards for complex digital subsystems
• Develop automated test systems using modern programming languages (Python, .NET) including instrument control, data acquisition, and automated pass/fail determination; LabVIEW support for existing systems
• Develop test firmware for embedded targets including SPI/I2C/UART communication protocols and diagnostic interfaces
• Execute environmental and qualification testing per MIL-STD-810H (thermal, vibration, shock, acceleration) and MIL-STD-461G (EMI/EMC) standards
• Perform ASIC integration testing including register read/write verification, state machine validation, and high-speed SPI interface testing
• Test high-speed digital interfaces including PCIe, Ethernet, DDR SDRAM, and complex power sequencing circuits
• Conduct burn-in testing, accelerated life testing, and reliability qualification campaigns
• Perform root cause analysis on test failures with first-responder anomaly triage and failure mode characterization
• Develop comprehensive test plans, test procedures, and formal test reports traceable to product requirements (JAMA, DOORS)
• Maintain test assets under configuration management with NIST-traceable calibration records
• Prepare and present Test Readiness Review (TRR) packages for qualification events
• Lead production test handoff activities including manufacturing test documentation and knowledge transfer
• Interface with design engineering, program management, manufacturing, and customers to resolve technical test issues

Required Qualifications:

• Bachelor's degree in Electrical Engineering, Computer Engineering, or related field
• Typically requires 6+ years of related experience in electronics test engineering
• Hands-on experience testing complex digital subsystems including FPGA verification and ASIC integration
• Strong programming skills in Python and/or .NET for test automation, data analysis, and embedded test firmware development
• Experience with test automation frameworks; LabVIEW proficiency preferred for existing test systems
• Experience with test firmware development for embedded systems including SPI, I2C, UART protocol implementations
• Demonstrated experience executing MIL-STD-810H and MIL-STD-461G qualification testing campaigns
• Strong experience with RF and digital test equipment including: spectrum analyzers, network analyzers (VNA), signal generators, oscilloscopes, logic analyzers, power supplies, and thermal chambers
• Strong experience designing and building test fixtures, cable harnesses, and test interface hardware
• Ability to write formal test procedures, qualification plans, and test reports to audit standards
• Experience with ruggedized military and space-grade electronics testing
• This position requires you to have or obtain a government security clearance. Security clearances may only be granted to U.S. citizens.
• Travel approximately 20% to external test facilities and customer sites

Preferred Qualifications:

• Master's degree in Electrical Engineering
• Experience with AI-assisted development tools (Claude Code, Cursor, GitHub Copilot, or similar) for accelerating test automation development
• Demonstrated ability to leverage modern development workflows and AI coding assistants
• Proficiency in C/C++, Rust, VHDL, MATLAB, and/or SQL for specialized test applications and data management
• Experience with radiation qualification testing at external facilities
• Knowledge of high-speed digital design including signal integrity and power integrity analysis
• Experience testing Intel (Xilinx) and AMD (Altera) FPGA-based systems
• Familiarity with Cadence design tools and design verification workflows
• Experience with 3U/6U VPX systems (VITA46, VITA65)
• Knowledge of Design for Test (DFT) and Design for Reliability (DFR) principles
• Requirements traceability tool experience (JAMA, DOORS)
• Experience with statistical process control and test data trending analysis
• Understanding of power supply testing and EMI compliance verification
• Existing Secret clearance or higher

Location:

• This position is on-site at Mercury Systems, Huntsville, AL
• Enjoy every other Friday off with our 9/80 work schedule!

* $87,100.00 - $182,900.00 annual salary for in-office or hybrid employees in FL, GA, IN, AZ, AL, MD or TX, and all remote employees
* $97,600.00 - $204,800.00 annual salary for in-office or hybrid employees in VA, CA, NH or MA
* $102,800.00 - $215,800.00 annual salary for in-office or hybrid employees in NJ

Mercury considers a variety of factors to determine individual base salary offers to candidates, including:

* the role and related responsibilities;
* prior work experience;
* education, training, skills and certifications;
* internal equity with others employed by Mercury in similar roles;
* geographic location; and
* alignment with market data.

In addition to base salary, Mercury provides a variety of benefits for team members including:

* bonus opportunities (or special incentives for sales positions);
* health, life and disability insurance;
* company-paid holidays and time off;
* 401(k) retirement plan;
* discounted employee stock purchase plan;
* tuition reimbursement; and
* access to professional development and personal wellness platforms including LinkedIn Learning, Headspace, Aaptiv and Virgin Pulse.

Team members at the Director or Vice President level are also eligible to receive annual stock-based awards.

Mercury offers a 9/80 alternative work schedule that provides employees more opportunity for work/ life balance (available based off location)

Mercury Systems is a technology company that makes the world a safer, more secure place. We push processing power to the tactical edge, making the latest commercial technologies profoundly more accessible for today's most challenging aerospace and defense missions. From silicon to system scale, Mercury enables customers to accelerate innovation and turn data into decision superiority. Headquartered in Andover, Massachusetts, Mercury employs more than 2,300 people in 24 locations worldwide. To learn more, visit mrcy.com

Our Culture

We are committed to making Mercury a great place to work, no matter where our employees are located. We offer a casual and enjoyable atmosphere that allows employees to learn and grow. We help and care for one another and work as one to achieve results for us and for our customers. We value communication and transparency, and strive to foster two-way dialogue at all levels of the organization. We are committed to lifelong learning, offering comprehensive skills training and tuition reimbursement. Whether you're just starting out on your career journey or you are an experienced professional, it's important to us that you feel recognized and rewarded for your contributions.

To find out more about Why Mercury?, or visit the Mercury Community or find answers to general questions at Mercury FAQs

Mercury Systems is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, age, sex (including pregnancy), sexual orientation, gender identity, national origin, genetic information, creed, citizenship, disability, protected veteran or marital status.

As an equal opportunity employer, Mercury Systems is committed to a diverse workforce. In order to ensure reasonable accommodation for individuals protected by Section 503 of the Rehabilitation Act of 1973, the Vietnam Veterans' Readjustment Act of 1974, and Title I of the Americans with Disabilities Act of 1990, applicants that require accommodation in the job application process may contact the number below for assistance.

(978) 256-1300

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